Brake mechanism



Patented July 8, 1947 UNITED 1 STATE 2,423,694 BRAKE MECHANISM Carolus L. Eksergian and Paul, W. Gaenssle, Dcs to The Budd Company, Philadelphia, Pa., a corporation of Pennsyltroit, Mich., assignor vania Application January 27, 1945, Serial No. 574,892

Claims. 1

The invention relates to brake mechanism and more particularly to such mechanism adapted for associationwith vehicles such as railway trucks.

The invention has for an object the simplification of the support for the brake mechanism and the facilitation of its manufacture and assembly in the truck structure.

It is a further object to mount the support so as to cushion the road shocks and to connect the support to the truck frame in such manner as to minimize the strain on the parts under the braking torque. v

It is a further object of the invention to provide a brake mechanism which is'well adapted for use with the type of railway truck shown in copending application, Serial No. 569,492, filed December 23, 1944, and entitled Rail car truck and in which the main side frame membersof the truck interconnecting the axles also serve as equalizers, these side members being interconnected by a transverse frame not interfering with the equalizing action of the side frame members but yet tying them together transversely and iongitudinally, all as fully disclosed in said application. It will be understood, however, that the invention is also applicable to the usual type of passenger car truck having a truck frame interconnecting the axles and separate equalizers supporting said frame from the axles or to other types of trucks.

These and other objects and advantages and the manner in which they are attained will become apparent from-the following detailed descrlption when read in connection with the accompanying drawings forming a part of this specification.

In the drawings,

Fig; 1 is a plan view of one end of a railway truck showing the invention applied thereto, parts being broken away and shown in section;

Fig. 2 is a side elevational view looking at the left-hand side of the parts of Fig. 1; and

Fig. 3 is an enlarged detail sectional view taken substantially along the line 3-3 of Fig. 1.

The truck with which the brake mechanism of the invention is shown associated comprises the longitudinally extending side members or equalizers l interconnecting the spaced wheel and axle assemblies, as 2, and the rectangular frame 3 resiliently mounted on the side members I and also provided with means for tying the side members together both laterally and longitudinally in a manner which need not be described in detail herein.

Each side member may comprise a box-section respective side frames l.

beam having a horizontally extending intermediate portion 4 merging at its ends in a generally vertically extending portion 5 forming, with a horizontal portion 6 extending from its upper end and a vertically downwardly extending portion I, a pedestal guide opening for receiving the journal box 8 of the associated wheel and axle assembly 2'. Resilient cushions, as 9, may be inserted between the top and sides of the journal box and the adjacent parts of the pedestal guide opening. A removable strap it) may interconnect the bottoms of the vertical portions 5 and 1.

Each wheel and axle assembly may comprise an axle ll having its ends rotatably supported in the respective journal boxes 8 and spaced wheels l2, 12 secured to the axle to rotate therewith.

Associated with each wheel 12 in a manner well known in the art is a brake rotor IS, in this instance a brake disc having radial braking faces on its opposite sides. A pair of brake stators, in this instance arcuate segmental shoes [4, M, are arranged in cooperative relation with the opposite faces of the respective discs.

To support the shoes and their actuating means, a transversely extending supporting beam I5 is provided, this beam pivotally carrying for each disc, as at l6, IS, a pair of brake levers l1, i! which pivotally carry, at l8, l8, an associated pair of shoes l4, M, the levers being actuated by a power unit [9 such as the piston and cylinder interposed between their ends opposite the shoe ends.

The ends of the support beam have reduced extensions, as 20, which rest in recesses 2| in the These recesses may be formed by sleeves 22 welded or otherwise secured to the opposite inner and outer walls of the associ ated box-section frame member, and these sleeves are preferably of substantially greater diameter than the reduced diameter and extensions 20 of the beam, so that a rubber annulus 23 of substantial thickness may be interposed between them, as shown.

These rubber annuli form cushions for efiecr tively cushioning the brake support and the parts carried thereby against road shocks. Further, they provide flexibility, permitting the necessary relative equalizing movements between the side frame members I and the slight relative movement between the wheel and axle assembly and the said frames without straining the parts unduly.

It will be noted by reference to Figs. 1 and 2 that the shoes M are offset toward the axle from the axis of the flexible joints 20, 22, 23 and are horizontalijprol eetion; ligparallelingthe adj acent reduced extension 20 ofthe support-beamgand; resting in a recess 28 formed in the associated box-section beam, by a sleeve 21 secured thereto. in a manner similar to the securement ot sleev 22, and to allow flexibility in the joint, thesleve 2'! is also of somewhat larger di ameter -than ,th projection 25 to permit the interposition bet ee them of a rubber annulus 28.'::-:=

While but a single torque arm 24 1;; been shown, and this is a generally desirable.arrange ment to avoid the irnpositioii,'by thebr'akesup port. of constraint uponthe free relativei'i move-gg".7

ment of the equalizers at the opposite sides of the truckgl-rit may: in some ;;cases .be a' more desirable ar'rangementetmhavela .torguearm simjl to 2 at "each end ofuthelbrake beam. 'By=*reterence Ltd Fi 1,. it, will be see ljoirits at theien'dsof-the brake: ybe'a substantiallyi'fthrough-gtheyfull rtransve I V 'r'iess ot the beam, iandwthemlqads are t symmetrically carried by the; side dram *res ect to their icentralrvertical; planes the lo'ads transmitted-to, the i'rarnes by a he support have'iln'oiptendencys omswing about a horizontal :axis; 1 By' reterence ctcidiiiss. g3, t 1 I that'thefioints- 20x22 and are arranged; in the -horiaoritally eextending portions 1,! loathe; ,respective side irames i: and'egiointli 5;, 526; 28; .is in the regionor -the vertically aextendingnlwltion 5, and by reference to Fig.=i 2,.-- substantially in, the same verticaltran'sver'se plane as'the' directipninwhich "-the resiiltant-iorce acts on the' shoera. T'his'arrangement has theeadvanta torqueis transmittedletos thenside; mem ers: in a region where they arei'exceedinglyszstifieagainst if bending, an'd' in a manneiwa minimizing the bendin'g strain on-the 's'ide' frame 'memberslrincident to l l the braking torque lax:

While the invention has "been:;herein :described specific embodimentwthereof'; .it Wilhbe-under- "stood that changes and l modifi'cations "may; 1 be planes of symmetry of the respective side mem- 6 bers through flexible I joint structures arranged in said planes 1 or the respective; side members at;

least one or said -joint fistructuresi lrcomprising *Q-speiced parts engaging v the adjacent side =meml her at spaced points, whereby to transmit ;braking torque-V tosaid-member; i 21 5: f 2. Ina brake mechanism for vehicles; al wheel i and axle assembly; longitudinally extending :Side members supported adjacent the oppositeends *th'ereofna brake rotorcarried by saidvassembly,

es, wheel a brake stator adaptedagito cooperate rotor, and a support for said stator extends transversely between said side members and which is supported at its ends substantially 5 in the vertical planes of symmetry of the respective side members through flexible joint structures arranged in said planes of the respective side members, at least one of which joint strucures isex ens se in a e 1 asliafa il P ere-b mitr'bmkmg torque to the adjacent sidiiie Her.

.3. In a brake mechanism for vehicles, a wheel axle assembly, longitudinally extending side ine'mbei'si supported adjacent the opposite ends otor carried by said assembly, apt ed to cooperate with said N upport beam for said stator having it ng in recesses in the respective side mem ers, yielding means interposed btweeri tli respe'ctive ends and the associated recesses and torque transmitting means secured to said'beam and extending laterally away from "members through flexible ittle-associated s1 m longitudinal region "of theyerti'c t w a 

